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2. a group of 210 students appeared in some test. the mean of 1/3 rd of students is found to be 60. the mean of the remaining studentsi found to be 78. the mean
2. A group of 210 students appeared in some test. The mean of 1/3 rd of students is found to be 60. The mean of the remaining studentsi found to be 78. The mean of the whole group will be: (1) 80 (2) 76 (3) 74 (4) 72
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Rishab Soni
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The mean of 1/3 of the student is 60 = The mean of 1/3 of the students of 210 is 60 = The mean of 70 students is 60 = Total score of 60 students = 60 X 70 = 4200 (1) Total mean of rest (2/3) of the students = Total score of 140 students is 78 X 140 = 10920 Total Score of the group is (10920 + 4200) / 210 = 72. The mean of the whole group is 72.
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